N-Fmoc-β-alanine is a protected derivative of β-alanine, featuring a 9-fluorenylmethoxycarbonyl (Fmoc) group attached to the amino group. This compound is a white to off-white crystalline powder with a molecular formula of C18H17NO4. The Fmoc group serves as a base-labile protecting group, widely used in peptide chemistry. Its primary and most significant application is as a key building block in solid-phase peptide synthesis (SPPS) using the Fmoc strategy. It is used to introduce the β-alanine residue into peptide chains. β-Alanine itself is a non-proteinogenic amino acid and a component of several biologically important peptides, such as carnosine. Therefore, N-Fmoc-β-alanine is essential for the research and production of peptides for pharmaceutical, biochemical, and biophysical studies. As a protected amino acid derivative, it is also a fundamental synthetic intermediate in organic chemistry for constructing peptide-like structures and other molecules requiring a protected β-amino acid moiety. It must be stored under cool, dry conditions and handled with appropriate personal protective equipment due to its potential as an irritant.